Where can I find regulators and more?

I need a 5-volt regulator (78L05), a hall sensor (SS495), an op-amp (LM348), and a P-channel MOSFET (IRF4905)? I need all these things for a magnetic levitron that I'm going to build. Do I have to get those exact models? (They are specified on the website that has the circuit scheme for it http://www.bis0uhr.de/index.htm?htt...sicsforums.com/showthread.php?t=643270&page=3).
Thanks for your help
PS. Just so you know, I'm very new at all of this, so forgive me if all the things I'm asking are really obvious.

Your part number suffix is for the TO-262 Package type. For a description of that see page ten of the datasheet.

You should print the complete datasheet and study it carefully. Everything about that part you need to know is there. This helps your understanding and makes it easier in the future while selecting parts for your next projects.

Cheers,
Bobbywhy

edit: Yes, Mouser is a reliable site to buy parts from. It's been around many years!